What apps can make a poster?

I would write html. You can show text, images, navigate through links.
No big show, no impress, but rational.

All depends on what you want to do: impress people, but leaving them not understanding, or really explain something.

Very old, but perhaps still fastest way to learn html to a level you can use it:

 
like this
11789.jpg
 
With html and the link I gave you, you can pack the same information, but visually much more primitive.

It has the advantage that that it is nicer for the eyes, the disadvantage that it does not impress, what today is very "important".

If you want to improve it visually, you need CSS, also not difficult to learn, but I do not know a good tutorial, and in my opinion is a waste of time.
 
No, it's scientific jargon. It's called posters.
1 a
: a usually large printed sheet that often contains pictures and is posted in a public place (as to promote something)
b
: a usually large printed sheet that is put on a wall as decoration

5a
: a flat piece of glass or plastic on which an object is mounted for microscopic examination
b(1)
: a photographic transparency on a small plate or film mounted for projection
(2)
: an electronic image presented as a part of a series
Kyle Patterson, the city's enterprise data strategist, flashed a series of PowerPoint slides with graphs of percentage growth since 1970.— Maria L. La Ganga
 
I have a medical conference and I need to do a poster presentation. What apps can make a poster?
Frankly, I don’t really understand the question. If you already do scientific research, this must not be first time you are writing some text document. You know, you can create posters with LaTeX (e. g. with beamerposter). If you prefer dragging text/image frames across the canvas, try a DTP program like print/scribus. You could even create posters with graphics/gimp3-app.
Code:
\documentclass[goettingen]{beamer}
\usepackage{beamerposter}
\usepackage[english]{babel}

% XeLaTeX stuff
\usepackage{fontspec}
\usepackage{xunicode}% has to be loaded after fontspec
\usepackage{xltxtra}
\usepackage[]{libertinus}% ensure x11-fonts/libertinus installed

% font stuff
\setmainfont[Mapping=tex-text]{Libertinus Serif}
\usepackage[protrusion=true,babel]{microtype}

\begin{document}
Happy Towel Day!
\end{document}
 


In my picture, each slide is a poster
 
Many years ago I stopped using LateX and began using plain TeX, now preprocessing it with Tcl.

But for presentation I insist that html is better. With links one can move to next or previous folium, or to some notes to present temporarily. One can publish it in the internet, keep it in disk during the presentation, etc.
 
Frankly, I don’t really understand the question. If you already do scientific research, this must not be first time you are writing some text document. You know, you can create posters with LaTeX (e. g. with beamerposter). If you prefer dragging text/image frames across the canvas, try a DTP program like print/scribus. You could even create posters with graphics/gimp3-app.
Code:
\documentclass[goettingen]{beamer}
\usepackage{beamerposter}
\usepackage[english]{babel}

% XeLaTeX stuff
\usepackage{fontspec}
\usepackage{xunicode}% has to be loaded after fontspec
\usepackage{xltxtra}
\usepackage[]{libertinus}% ensure x11-fonts/libertinus installed

% font stuff
\setmainfont[Mapping=tex-text]{Libertinus Serif}
\usepackage[protrusion=true,babel]{microtype}

\begin{document}
Happy Towel Day!
\end{document}
I'm just an undergraduate, and this is my first time to make a poster. I'm doing it for my advisor.
 
I'm not quite sure what you actually mean, since poster to me means a single large sheet - so if the graphics are already given, which was another question, the job was mostly to resize the graphics to fit the format.
If slides of a presentation are meant, then the quickest and easiest way to create a presentation I know, is as Espionage724 already said, using LibreOffice Impress ("Powerpoint").
There are also some other ways/progs to create presentations, like there are some LaTeX packages providing different ways for creating presentations, but if you are not already a well versed LaTeX user I wouldn't recommend that way for this project, since I guess there is not enough time to learn several tool plus LaTeX, plus learn how to make a good presentation slides, plus create the slides.

Old engineering wisdom:
You either do a new job with old tools (already well versed on).
Or you use new tools on an old job.
But never do a new job with new tools.

So, you better use a well versed jobs as a chance to learn new tools, to enlarge your toolbox. 🤓

Graphics:
If the graphics are given, they are hopefully at high resolution or even better as vector graphics. The latter ones can be down- and upscaled without quality loss. Raster graphics (.jpg, .gif, .bmp,...) can only be downscaled at good quality.
To enlarge low resolution pictures Gimp provides a lot of tools to adjust picture quality. But don't demand magic. Besides the tools are not easy to use for newbies, enlarging a raster graphics means adding pixels - filling the gaps of missing information. You could try some AI based tool, but missing information stays missing information. All also any AI can only do is guessing what would fill the gaps between the pixels.

The "onboard" graphics editor of Powerpoint/Impress is more than quite sufficient enough for producing own graphics for presentations. Otherwise Inkscape was a good choice (question is again, which tools you already know to use.)

Anyway, the pictures you are showing are good for some poster, but they are (very) bad for a presentation - way too much information density; impossible for any audience to grasp while a presentation runs; except the slides are not meant to be shown while a presentation, but to study for anybody for themselves. Anyway I hope that's not the only quality you have, but there is (way) better, because they... - frankly: they suck. 😎 Nobody is going to give those blurry things a closer look. 🥸

The precept for presentation's slides is:"Less is more. The less, the better." Because the slide show supports the speaker, not replace her/him, and the audience neither want's to read a book, nor watch a video, but listen to what the speaker has to say.
Enjoy Don McMillan to learn about how to not make PP presentations.
 
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